Imaging Surface Correction Map for Lens-Sensor Defocus Compensation
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Solution Overview
Problem
In imaging apparatuses, especially lens interchangeable types, the detection precision of subject distances is compromised due to manufacturing errors and optical characteristics of lenses and image sensors, requiring separate correction information for each combination of lens and camera body.
Innovation Solution
An imaging apparatus with a detachable lens device, featuring a calculation unit to determine defocus amounts and a correction unit that uses specific correction information for optical characteristics of the lens and imaging surface inclination to improve imaging surface correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate correction information is stored for each lens-camera body combination, then imaging surface correction precision is improved, but device complexity and data management burden increase
Solution Approach 1:
The correction information is segmented into two independent parts: lens-specific correction information (stored in lens device) and camera body-specific correction information (stored in camera body). This segmentation allows each part to be managed independently, reducing the complexity of managing combined correction data for every lens-camera combination while maintaining high correction precision through the combination of both parts.
2Adaptability or versatility
If correction information is integrated into lens device only, then data management is simplified, but adaptability to different camera bodies is reduced
Solution Approach 1:
The correction system is designed with universal compatibility by separating correction information into lens-specific and camera body-specific components. The lens device stores correction information that can be universally applied across different camera bodies, while the camera body stores its own correction information. This multi-functional design allows the same lens correction data to work with multiple camera bodies, enhancing adaptability without requiring unique correction sets for each combination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the detection precision of defocus information and subject distances by accurately accounting for lens and sensor characteristics, improving the imaging surface correction process.
Implementation Method 1
an imaging unit configured to include a plurality of photoelectric conversion units that receive light fluxes passing through and incident on different pupil regions in an imaging optical system of the lens device and output a plurality of signals
Data Source
AI summary
An imaging apparatus receive light fluxes passing through and incident on different pupil regions of an imaging optical system and generates at least image data of one pair of subject images. Imaging surface correction information regarding a manufacturing error or optical characteristics of design of an imaging lens is transmitted from a lens control unit of the imaging lens to a system control unit of a camera body, and then the system control unit receives the imaging surface correction information. The system control unit performs a process of generating a defocus map based on a parallax between at least one pair of images and performs imaging surface correction through correction of the calculated defocus amount. In the imaging surface correction process, influences of the optical characteristics of the imaging lens and an inclination of an imaging surface of an image sensor are corrected, and thus a more accurate distance map is generated.